long-case clock;
thirty-hour clock;
weight-driven clock
- Museum number
- 2010,8029.70
- Description
-
Movement and Dial of a Thirty-Hour Longcase Clock.
Case: Missing
Dial: Square solid brass dial with four gilt-brass female mask Rococo spandrels. Silvered-brass chapter ring with Roman numerals I-XII and fleur-de-lys half-hour marks outside a circle calibrated for quarters. Around the outside is a circle calibrated 0-60 for the minutes and marked with Arabic numerals at five minute intervals and with lozenges at the half-quarters. The area inside the chapter ring is matted with an engraving of three birds in flight in the upper half, two of which are carrying a branch with leaves in their beaks. In the lower half and surrounding the square aperture are engraved foliate scrolls with a bird in flight. The aperture reveals a silvered brass ring marked 1-31 for the date. The maker’s name and surname are engraved between V and VII. The place is engraved between 25 and 35 on the minute circle. Blued-steel hour and minute hands.
Movement: Weight-driven, posted-frame, thirty-hour movement with brass top and bottom plates and three brass bearing bars. The rectangular pillars are steel. Brass sprockets and shrouds for Huygens endless chain maintaining power. Pendulum control, the pendulum with plain steel rod and brass-fronted lead bob. Three-wheel going-train, the brass wheels with four crossings. Anchor escapement, the brass escape wheel with four crossings. Three-wheel striking train, the brass wheels all with four crossings and a fly-pinion with a brass vane. Striking for hours is controlled by a brass count-wheel mounted on the rear bearing bar and retained by a brass tension spring. The hours are struck on a bell mounted on a standard screwed to the top plate.
Motion work: The motion work consists of a canon pinion mounted on the centre wheel arbor which drives the minute wheel and pinion and also carries the minute hand. The minute pinion drives the central hour wheel which carries the hour hand. A pinion mounted in front of the hour wheel drives an intermediate wheel which has a pin to index the date ring.
The drive chain passes around a solid brass pulley and through a lead ‘doughnut’ counterweight.
The driving weight is missing.
- Production date
- 1745- 1755
- Dimensions
-
Height: 31 centimetres (overall)
-
Width: 28 centimetres (dial)
-
Depth: 15 centimetres (overall)
- $Inscriptions
-
- Curator's comments
- The spandrels and theifr fixing screws are modern.
- Location
- Not on display
- Acquisition date
- 2010
- Department
- Britain, Europe and Prehistory
- Registration number
- 2010,8029.70